This name is a synonym of Ismene longipetala (Lindl.) Meerow.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 278925) with original publication details: Pl. Life 19: 49 1963.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:125571-2.
This name was in version 1 of The Plant List, record kew-278925, and has not been changed.